问题
填空题
已知cos(α+
|
答案
∵cos(α+
)-sinαπ 6
=
cosα-3 2
sinα-sinα1 2
=
cosα-3 2
sinα3 2
=
(3
cosα-1 2
sinα)3 2
=
sin(3
-α)=π 6
,3 3 5
∴sin(
-α)=π 6
.3 5
故答案为:3 5
已知cos(α+
|
∵cos(α+
)-sinαπ 6
=
cosα-3 2
sinα-sinα1 2
=
cosα-3 2
sinα3 2
=
(3
cosα-1 2
sinα)3 2
=
sin(3
-α)=π 6
,3 3 5
∴sin(
-α)=π 6
.3 5
故答案为:3 5